Variable electric condenser



May 27, 1930.

9 W. w. DRURY VARIABLE ELECTRIC CONDENSER Filed Jan. 9. 1924 any of F"maximise rises to variable electric n which a numbci 03f rs of the typesemicircular golcies carried by s central shaft can turned so as tooverlap to varying; clegrees'e number of pistes In such e-condensei? itis necessary that the various places should be accurately adjusted\DiClQFf there may be no risk of. any of the moving plates coming intoconfcci with the fixed. plates between which they move 2; e considerableskill is necessary assembling the various parts:

7 i) this invention such condenser can be read end. quickly produced byunskilled icccrling to this invention a hollow spinformed in itpreferably by bank umber of transverse slots encl into the moving platesare inserted so Le accurs'ely right angles the wi Jiir e. A mandrel ofthe same shape the slicific of "she finished insists gll the hollowspinmolten metal, such as type metal, is and allowed to fill the spacebetween the plates secures! in shei1 ilcw spindle Tile meylcel is thenforced out and the mov- M plates unit is in'plsce with moving; platesbetween the fixes-1 plates which are secured slots a tween the mp andlocci/oin plates of the inscrume p l refei'clly there are slo'ewceclpillars, but the fiye plates are solclerecl into one only cfcliese p c sto allow for expansion and to any tendency ice pieces to insisrnniens Iwe r fiio e, c 'aral hole, say from is introduces c collar, Whilebetween '2 anfi the hollow spindle is insefeci a l eel spring or Washer.A spindle is then passeol sewage the cellar, the washer e hollowspinolle and is secures? in the hollow spindle icy ecljns bing nut Thecollar is fixed-to the s preferably by means of c caper pin. A centre sW which screws in'o "she bottom.

and secs as the loot bearing is:

icaiien filec'i January 9, serial life. and Greet .El'itsin can rextending bethe spaces between s c core i'onncl the mend eii Ine Wlio'ieunit is ailoweci cool. er izlien wicluirewii item the The men. xrelshaft is then u (10111 of rotation. my 1 a mules justinp nut ali'esclymenlzionec. helical. spring or WiLSiZQIi more or less the moving; platescan be accurately positioned so that moving plates lie symmeizrb ccllybetween. the [i ccl plates When thislias been done hollow spindle issecured to the shaft, for insivance, m ans of e grub screw l Theinvention is illustratedby the accom panying iiiawing Figure 1 O): whichis a vertieal section through a conclen in accorc mce therewith, W1. and3 are fragmentary side dons of the lioiiow spindle plate in positiontheei, in

Two plates Whic the :fron'l; end re"- as a mounting for three A havebeen slotaecl by n can to receive the sol-clered into low for expansionand-teen clency to buckle The siocei" use of Washers for the ps -pose ofFour is hollow spindle of brass slotted means of through belisnfiicieniv plates B 'cliesc ceiii; ensures tliai: che lie glee so theof the hollow spine ell are a L osi'sion a steel 1" the SQIHG SGCI'DiOZEas the shaf 5 is inserted clirongh the senate holes F) i the plates andis held l d eccnrcsely along the l s oi sliehol lea lz iclten met tneaci- Q, serve pills-rs 8 which cing.

nos forced out and inoving'pls'tes unit nsercecl in its appropriateplace with re- ""ie fixed The brass shaft 5 ed tl 'ongli the encl plate1, a collar helical spring or washer 7 "alien no moving pieces unit andgel si /e suiiicient free- 5c coii oress the by means of.

alter this and compress the moving plates unit against the washer orspring 7. .When the symmetrical dispesition'is reached the grubscrew orset screw 11 is tightened up, thus securely locking the moving platesunit to the shaft and obviating any possibility of the adjustment beinglost.

Electrical connection to the plates B may be made in any suitablemanner, for example, a flexible phosphor bronze lead strip soldered to.the collar 6 and affixed to the front plate 1. The electricalconnection to-the fixed plates A may be made through one of the pillars3 which are insulated from the front plate by means of ebonite plates 12to which the pillars are secured 'or in any other suitable manner.

, Having described my invention what I claim is:

1. A rotating element of a rotating plate condenser having a hollowspindle to which the plates are attached, a shaft for the spindle andmeans independent of the means for attaching the plates to the spindlefor adjustsplndle and shaft said adjusting means including a yieldablemember.

2. A rotating plate condenser comprising a stationary element, arotating element hav: ing a hollow spindle to which the plates areattached, end pieces between which the stationary and rotatable plateelements are mounted and means for positioning and-supporting therotating element between the end pieces comprising a shaft passingthrough the spindle and threadedat one end, a nut co-operatingtherewith, a spring at the other end of the shaft pressing against theadjacent end of the spindle, said nut and said spring being adapted tocooperate for adjusting the longltudinal position of the plate elementon the shaft.

3. A rotating plate condenser comprising a stationary element, arotating element, said rotating element having a hollow spindle to whichthe plates are attached, end pieces between which the stationary androtatable elements are mountedand means for position-,

ing and supporting the rotating plate element between the end piecescomprising a shaft passing through the spindle and threaded at one end,a collar at the other end, a nut cooperating with the threaded end, anda spring around the other end of the shaft disposed between the spindleof the rotating plate element and the collar, said spring andsaid nutbeing adapted to cooperate for adjusting the in the relative axialposition between the essrs on the shaft.

4. A rotating plate condenser comprising a stationary element, arotating element, said rotating element having a hollow spindle to whichthe plates are attached, end pieces belongitudinal position of therotating element 5. A rotating plate condenser comprising a stationaryand a rotating element, said rotating element having a hollow spindle towhich the plates are attached, end pieces between which the stationaryand rotatable elements are mounted,va shaft passing through the hollowspindle, said shaft being threaded at the one end and having a shouldernear the other end,'an adjustable center screw cooperating with the endpiece adjacent the threaded end of the shaft, a nut cooperating with thethreaded end of the shaft and a spring around the shaft and nut and theshoulder, said nut and said spring being adapted to cooperate to adjustthe longitudinal position of the plate element on the shaft.

6. A rotating plate a stationary and a rotating element, said rotatingelement having a hollow spindle to which the plates are attached, endpieces between which the stationary and rotatable elements are mounted,a shaft passing through the spindle, an adjustable set screw threadedthrough one of the ends and cooperating with the shaft to adjust thelongitudinal position of the shaft, a collar adapted to be fastened onthe other end of the shaft and to be moved against the corresponding endpiece by adjustment of the set screw, a spindle carrying the movableelements and slidably mounted on the shaft, said shaft being threaded atone end and having a nut on said threaded end for adjusting the spindleand a spring on disposed between the I ios spindle against the nut. l

7.. In a rotating plate condenser, a stationary element. and a rotatingelement having a hollow spindle to which the plates are attached,'ashaft for the spindle, means including a resilient element for adjustingthe relative axialposition between the spindle and the shaft and meansindependent of the means for attaching the plates to the spindle tomaintain permanently the adjusted position of the spindle and shaft.

8. In a condenser, a group of relatively fixed plates, a second group ofplates fixedly a shaft within the spin- 0116 group ef pl of the meansfer eh es the spi ieieiuive rte the sh ans eemprising a 1110.

silieniz membei rising a hollow spi" ates thereto a sh e aed meansfixing the-plates the relative 5 and means, 31" fixing the pisfees legthe releiiive 2. e spindle and s s ting means con? Tfi 1 csi'gien 1nieii'aioiieci a nut screw iioliow s'pindi yieic' said spimile to saifisiii eemprising statie e PiZWES, means suppers, 1e ter comprisingrelatively entrie shafts, means, mouieed e shafts yieidably abutting theO'ililel" s means for moving the ,i s1 11s e ioned means.

' ALTER PERU

